import pandas as pd
import geopandas as gpd
from shapely.geometry import Point
import folium
from folium.plugins import HeatMap

# read in layer and point data
data_df = pd.read_csv('mps_robbery_policeuk12m.csv')
bocu_gdf = gpd.read_file('bocu_wgs.geojson')

# create point geo data
geometry = [Point(xy) for xy in zip(data_df['longitude'], data_df['latitude'])]
data_gdf = gpd.GeoDataFrame(data_df, geometry=geometry)
data_gdf = data_gdf.set_crs(4326)

# check coordinate reference system
print('CRS for data_gdf:', data_gdf.crs)
print('CRS for bocu_gdf:', bocu_gdf.crs)

CRS for data_gdf: epsg:4326
CRS for bocu_gdf: epsg:4326

valid_geom = data_gdf[data_gdf.geometry.is_valid]
print(valid_geom.geom_type.unique())
valid_geom = bocu_gdf[bocu_gdf.geometry.is_valid]
print(valid_geom.geom_type.unique())

['Point']
['MultiPolygon']

may2022 = data_gdf.query("month == '2022 May'").copy()
jun2022 = data_gdf.query("month == '2022 Jun'").copy()

Create an interactive heatmap with polygon boundaries

# map points as a heatmap on folium

# create map
m = folium.Map(location=[51.5074, -0.1278], zoom_start=14)

# Add heatmap layer
heat_data = [[point.y, point.x] for point in data_gdf.geometry]
HeatMap(
    heat_data,
    radius=15, # radius of each data points influence in pixels
    blur=10, # radius of blur in heatmap pixels
    gradient={0.3: 'white', 0.6: 'yellow', 0.8: 'orange', 0.9: 'red', 1: 'magenta'}, # setting colour gradient
    overlay=True,
    name='Robbery Hotspots').add_to(m)

# Add boundary layer
folium.GeoJson(
    bocu_gdf,
    name='BOCU',
    style_function=lambda x: {
        'color': 'black',
        'weight': 2,
        'fillOpacity': 0
    }
).add_to(m)

folium.LayerControl().add_to(m)

m

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Create multiple interactive heatmap with polygon boundaries

# map points as a heatmap on folium

# create map
m = folium.Map(location=[51.5074, -0.1278], zoom_start=14)

# Add heatmap layers
heat_data1 = [[point.y, point.x] for point in may2022.geometry]
heat_data2 = [[point.y, point.x] for point in jun2022.geometry]

HeatMap(
    heat_data1,
    radius=15, # radius of each data points influence in pixels
    blur=10, # radius of blur in heatmap pixels
    gradient={0.3: 'white', 0.6: 'yellow', 0.8: 'orange', 0.9: 'red', 1: 'magenta'}, # setting colour gradient
    overlay=True,
    name='May Hotspots').add_to(m)

HeatMap(
    heat_data2,
    radius=15, # radius of each data points influence in pixels
    blur=10, # radius of blur in heatmap pixels
    gradient={0.3: 'white', 0.6: 'yellow', 0.8: 'orange', 0.9: 'red', 1: 'magenta'}, # setting colour gradient
    overlay=True,
    name='June Hotspots').add_to(m)

# Add boundary layer
folium.GeoJson(
    bocu_gdf,
    name='BOCU',
    style_function=lambda x: {
        'color': 'black',
        'weight': 2,
        'fillOpacity': 0
    }
).add_to(m)

folium.LayerControl().add_to(m)

m

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Add a point layer

# map points as a heatmap on folium

# create map
m = folium.Map(location=[51.5074, -0.1278], zoom_start=12)

# Add heatmap layer
heat_data1 = [[point.y, point.x] for point in may2022.geometry]
heat_data2 = [[point.y, point.x] for point in jun2022.geometry]

HeatMap(
    heat_data1,
    radius=15, # radius of each data points influence in pixels
    blur=10, # radius of blur in heatmap pixels
    gradient={0.3: 'white', 0.6: 'yellow', 0.8: 'orange', 0.9: 'red', 1: 'magenta'}, # setting colour gradient
    overlay=True,
    name='May Hotspots').add_to(m)

HeatMap(
    heat_data2,
    radius=15, # radius of each data points influence in pixels
    blur=10, # radius of blur in heatmap pixels
    gradient={0.3: 'white', 0.6: 'yellow', 0.8: 'orange', 0.9: 'red', 1: 'magenta'}, # setting colour gradient
    overlay=True,
    name='June Hotspots').add_to(m)

# Add point layer
point_layer = folium.FeatureGroup(name='Point data')

for index, row in may2022.iterrows():
    latitude=row['latitude']
    longitude=row['longitude']
    
    point = folium.Circle(
        location=[latitude, longitude],
        radius=2,
        color='black',
        fill=True
    )
    
    point.add_to(point_layer)
    
point_layer.add_to(m)

# Add boundary layer
folium.GeoJson(
    bocu_gdf,
    name='BOCU',
    style_function=lambda x: {
        'color': 'black',
        'weight': 2,
        'fillOpacity': 0
    }
).add_to(m)

folium.LayerControl().add_to(m)

m

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